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  1. #1

    Default No start- low oil pressure

    My 2000 Suburban stopped running as I was driving along at about 30 mph, and the low oil pressure light came on and the truck died.

    It will crank, but will not start.

    I noticed a couple of other things. I had about 1/3 of a tank, and no low fuel light on, but once it died, the fuel guage is not reading any fuel. Also, the dear shift indicator box that tells you what gear you are in is not lighting up. I put another 5 gallons of fuel in and still nothing is registering on the fuel guage.

    I get the feeling there is some sort of protective mode for the car, so that if there is low oil pressure you do not blow it up.

    I tried quick start to eliminate fuel supply as the problem, and when I checked for spark, there is none.

    Any ideas?

  2. #2
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    Welcome to the site! Have you tried to add oil to it? I know that GM has a low oil pressure sending unit that will do that to protect the engine in the event of low oil so try adding oil and see what happens.
    Darcy
    Washington State
    2006 Silverado 2500HD LT3 4X4 CC SB Duramax LBZ
    Tuff Country 6" lift, 35" Toyo M/T's on 20" Ultra Peacemaker wheels, Quadzilla Stealth2 programmer, Diamond Eye 5" cat-back exhaust, factory Special order color Yellow.

  3. #3

    Default

    Mght also be a blownfuse. The gear indicator should work no matter what. Simply turning the key to the on position should yield the gear. Check your fuses and oil level. Right now might just be a good time to change the oil. Check to make sure you don't have any large metal stuff in the oil as it's draining... Good luck
    Christopher

    1991 Chevy Suburban 1/2 ton 2WD w/ chevy SBC 350-3/4 ton drivetrain upgrade w/4.10 gears 200K miles
    2005 Saturn ION-2 Stock 277K miles
    1982 Bronco, 1993 Bronco (sold), 1971 M35A2 Deuce and a Half



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  4. #4

    Default

    I changed the oil a couple of weeks ago. I checked it and it was full. No loud noise or anything when it stopped. It just kind of shut off.

    When I crank it, I am getting a 40 lbs reading on the guage while it is cranking.

    I checked some of the fuses, but I guess I need to play with the relays and the fuses.

  5. #5

    Default

    sounds like fuel pump. can you hear the fuel pump whine when you turn the key to [on]

  6. #6

    Default

    and it was........ the fuel pump.

    Thanks.

  7. #7

    Default

    FYI...the protection system is setup so that if you lose oil pressure, the fuel pump will shut off. If you start having long cranks before the motor will start, it is due to this protection system usually. What happens is the fuel pump relay goes bad so you don't have any fuel pressure, but as you crank the motor the oil pressure rises up and once it gets past 40psi(I think), it bypasses the relay and turns on the fuel pump which starts the motor. So if you have long crank times...check your fuel pump relay!!

    Doug

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